https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79433
--- Comment #21 from Marc Glisse <glisse at gcc dot gnu.org> --- (In reply to Jonathan Wakely from comment #20) > A solution that only work for GCC isn't a very good solution, because the > whole point of the feature-test macros is to have portable checks that work > across implementations. I've spoken to the libc++ maintainers and they are > strongly opposed to lots of different sub-directories. Ah, so it would work, but the issue is that libc++ refuses to do the same. Since Microsoft is ignoring SD6 as well, it makes this portability mechanism useless. Ok, thanks. I guess the pragma idea is not bad. (in principle we could use multiple subdirectories in libstdc++ and let libc++ use pragmas, but using the pragmas is probably easier for libstdc++ as well) (I didn't find a corresponding PR in llvm's bugzilla)
